Abstract: A high pressure gas transmission compressor having valve chambers incorporating valves located in common valve pockets where the center lines of the valve chambers are non-intersecting with the compressor cylinder. In a first embodiment, the valve housings are vertically positioned at each end of the cylinder such that the valve chambers are parallel to each other and perpendicular to the cylinder with the ends of the chambers extending on either side of the cylinder. Each valve chamber contains discharge and suction valves, with the outlets of the discharge valves being joined to the discharge port of the compressor by a semi-cylinder like annular discharge cavity spaced from and partially surrounding a portion of the cylinder. The inlets of the suction valves are joined to the suction port by a similar semi-cylinder like annular cavity. In other embodiments, the compressor includes four valve housings spaced about 90.degree.